Παραπομπή APA

Malberbe, I. V. (1948). Soil fertility (3.). Oxford university press.

Παραπομπή Chicago Style

Malberbe, I V. Soil Fertility. 3. U S A: Oxford university press, 1948.

Παραπομπή MLA

Malberbe, I V. Soil Fertility. 3. Oxford university press, 1948.